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    CVE-2021-26717

    An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

    Published:Feb 18, 2021
    Last Modified:Nov 21, 2024
    EPS:Feb 18, 2021
    EPSS Score:0.0044
    CVSS Score:7.5

    Affected Products

    Vendor
    Digium
    Product
    Asterisk
    Vendor
    Digium
    Product
    Certified Asterisk

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2023-37457 (CVSS 7.5) — Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and pri…
    CVE-2023-49294 (CVSS 4.9) — Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.…
    CVE-2021-46837 (CVSS 6.5) — res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certifi…
    CVE-2022-26498 (CVSS 7.5) — An issue was discovered in Asterisk through 19.x. When using STIR/SHAKEN, it is possible to download files tha…
    CVE-2022-26651 (CVSS 9.8) — An issue was discovered in Asterisk through 19.x and Certified Asterisk through 16.8-cert13. The func_odbc mod…
    CVE-2022-26499 (CVSS 9.1) — An SSRF issue was discovered in Asterisk through 19.x. When using STIR/SHAKEN, it's possible to send arbitrary…
    CVE-2021-32558 (CVSS 7.5) — An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and …
    CVE-2021-31878 (CVSS 6.5) — An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without…
    CVE-2021-26713 (CVSS 6.5) — A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, an…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High